Pre-Production
WM8940
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously
operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given
under Electrical Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to
damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this
device.
Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30°C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
DBVDD, DCVDD, AVDD, SPKVDD supply voltages
Voltage range digital inputs
MIN
-0.3V
MAX
+4.2
DGND -0.3V
AGND -0.3V
-25°C
DVDD +0.3V
AVDD +0.3V
+85°C
Voltage range analogue inputs
Operating temperature range, TA
Storage temperature prior to soldering
Storage temperature after soldering
Notes
30°C max / 85% RH max
-65°C
+150°C
1. Analogue and digital grounds must always be within 0.3V of each other.
2. All digital and analogue supplies are completely independent from each other.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
DCVDD
TEST CONDITIONS
MIN
1.71
1.71
2.5
TYP
MAX
3.6
UNIT
Digital supply range (Core)
Digital supply range (Buffer)
Analogue supplies range
Ground
V
V
V
V
DBVDD
AVDD, SPKVDD1
3.6
3.6
DGND,AGND, SPKGND
0
Notes
1. Analogue supply voltages must not be less than the digital supply voltages
2. DBVDD should not be < DCVDD
Pre-Production, Rev 3.0, February 2007
7
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
